Ford alarm troubleshooting

2007 ford galaxy rear tail lights (three in rear door)do not work on drivers side (passenger side works) - all bulbs checked and are good - no reference to any fuses in manuals - some discussions refer to a body control module (?) - any clues

If more than one light on the same side do not work, check grounds in the rear, most of the time the left and right sides use different grounding points. As for the Body control module, i doubt the problem is there, as there would probably more than just that going wrong if it was faulty. The BCM (body control module) is usually located under front seats, or hidden in the dash somewhere. I would like to be more precise on location, but we don't have ford galaxys in my country. Well... not any 2007 galaxys anyway, only 1970s and older. :P

Testimonial: "Thanks for quick response - from looking I think all the lights in the cluster use a common ground and the others (reverse and fog) work okay - off to shop to buy a meter to see if getting power to tail lights when switched on"

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I would guess that you need a new bulb. Many of these tail lights actually have two filaments inside them, one that is used for a dimmer light (running light) and one that is used for a brighter light like (brake light, turn signal). The easiest thing to try (and probably the cheapest) would be to buy a replacement bulb and change it. Most places that sell automotive light bulbs will have a large catalog where you look up the make model and year of the car you need a light for and it will tell you which replacement bulb you will need. Then look in your cars manual to see how you access and replace the bulb.

You don't really need a diagram, it's simple. If you open both tail light boxes in the trunk you will see at the connector on the bottom a yellow wire in the first position. That goes to the brake bulb. If both tail lights do not work, make sure you are getting power to the driver side light first, if it is not getting power, the passenger side will not work either, they are in line with each other. If it is only the passenger side not working, the bridging wire could be bad.. try jumping it. Also, make sure you are getting power inside the tail light bulb holder. The metal connections can come loose. If there is no power to the driver side tail light it could be the bulb failure relay, that is the round red relay in the rear left side of the fuse box behind the ash tray/ cigarette lighter below the radio in front of the shifter. You should be getting power to the third brake light in the rear window...that is a different circuit and will not be affected. Try changing out the bulb failure relay, it supplies the power to the tail lights.

I hope you arent letting a simple thing like a burnt bulb ruin your day??Im not sure what you have checked so far but start with replacing the bulb,check the connector very good as this has been an issue on many makes and models

If the driver's side tail light is working, it's not a fuse. Use a test light to check for power at the bulb holder. One terminal will be for tail light, the other for brake/turn light. If the is constant power for tail light, replace bulb. If no power, trace wiring from bulb holder to driver's side junction. Probable broken wire between the two tail lights.